UD Connection Issues

GSI and SMI Are Well-Known UD QPs

A port's GSI (QP1) and SMI (QP0) are specification-defined UD QPs that are used to send and receive GMPs and SMPs, respectively. In other words, they provide management-related services.

CA May Implement Service(s) Using Known UD QPs

In addition to its GSI and SMI UD QPs, a specific CA may implement one or more non-management services using UD QPs with QP numbers that are well-known (e.g., by its device driver). In this case, software can send and receive messages with these QPs in a remote CA (because the destination QPN is known to the driver).

CA May Implement Service(s) Using Unknown UD QPs

General

On the other hand, a CA may provide one or more additional, non-management services through ...

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